Telescopes
... differently depending on wavelength • Some light traveling through lens is absorbed • Large lens can be very heavy, and can only be supported at edge ...
... differently depending on wavelength • Some light traveling through lens is absorbed • Large lens can be very heavy, and can only be supported at edge ...
Daniel Gogny and RCS - Cea-Dam
... • King computer of mid eighties was Cray X-MP, delivering less than 1 Gflops peak • Y-MP much better: > 2 Gflops,but it was not enough… X-MP ...
... • King computer of mid eighties was Cray X-MP, delivering less than 1 Gflops peak • Y-MP much better: > 2 Gflops,but it was not enough… X-MP ...
Assessing age-related changes in the biomechanical properties of
... Developed a co-focused ultrasound and OCE system to study the biomechanical property of the rabbit lens; 2) The parameters of maximal displacement, natural frequency can be used for assessment; 3) Stiffness of the rabbit crystalline lens increases with age; 4) Prospective future work would be to co ...
... Developed a co-focused ultrasound and OCE system to study the biomechanical property of the rabbit lens; 2) The parameters of maximal displacement, natural frequency can be used for assessment; 3) Stiffness of the rabbit crystalline lens increases with age; 4) Prospective future work would be to co ...
Lecture Notes
... To obtain the locations of the minima, the slit was equally divided into N zones, each with width x. Each zone acts as a source of Huygens wavelets. Now these zones can be superimposed at the screen to obtain the intensity as a function of , the angle to the central axis. To find the net electric ...
... To obtain the locations of the minima, the slit was equally divided into N zones, each with width x. Each zone acts as a source of Huygens wavelets. Now these zones can be superimposed at the screen to obtain the intensity as a function of , the angle to the central axis. To find the net electric ...
Lecture 14 Images Chapter 34
... The ray approximation states that light travels in straight lines until it is reflected or refracted and then travels in straight lines again. The wavelength of light must be small compared to the size of the objects or else diffractive effects occur. ...
... The ray approximation states that light travels in straight lines until it is reflected or refracted and then travels in straight lines again. The wavelength of light must be small compared to the size of the objects or else diffractive effects occur. ...
Diffracted Light Contrast: Improving the Resolution - Microscopy-UK
... a narrow slit aperture. When such an aperture is inserted at the level of the field stop and the condenser is defocused from its normal Koehler position, interference bands form between the two edges of the slit, indicating the presence of coherent, diffracted light, and these interference bands may ...
... a narrow slit aperture. When such an aperture is inserted at the level of the field stop and the condenser is defocused from its normal Koehler position, interference bands form between the two edges of the slit, indicating the presence of coherent, diffracted light, and these interference bands may ...
To determine the wavelength of a monochromatic source of light
... plate of glass by suitable grinding and polishing, the obtuse angle of the prism (which is only slightly less than 1800). The optical bench consists of two metal rails graduated accurately in millimeters. The bench is provided with the three metal uprights which can slide along the rails and their p ...
... plate of glass by suitable grinding and polishing, the obtuse angle of the prism (which is only slightly less than 1800). The optical bench consists of two metal rails graduated accurately in millimeters. The bench is provided with the three metal uprights which can slide along the rails and their p ...
Refraction and Lenses Learning Guide
... refraction for water, glass, most plastic depends on wavelength 15. Which is greater, the index of refraction for blue light or red light? greater for blue than red 16. What is chromatic aberration and how can it be reduced with lenses? since different colors are refracted at different angles, they ...
... refraction for water, glass, most plastic depends on wavelength 15. Which is greater, the index of refraction for blue light or red light? greater for blue than red 16. What is chromatic aberration and how can it be reduced with lenses? since different colors are refracted at different angles, they ...
Three Lasers Converging at a Focal Point : A Demonstration
... 3. Now replace the glass block with the positive lens. Two things to note here: The center laser beam needs to go through the center of the lens, and the set up should have the screen placed at a distance away from the laser such that the three spots are similar in appearance as they were for the gl ...
... 3. Now replace the glass block with the positive lens. Two things to note here: The center laser beam needs to go through the center of the lens, and the set up should have the screen placed at a distance away from the laser such that the three spots are similar in appearance as they were for the gl ...
Confocal microscopy with a volume holographic filter
... The pinhole preceding the detector in a confocal microscope is a shift-variant optical element. On-axis in-focus point-source objects are imaged exactly inside the pinhole and give maximal intensity. An out-offocus object, even when it is on axis, is equivalent to an extended source on the input foc ...
... The pinhole preceding the detector in a confocal microscope is a shift-variant optical element. On-axis in-focus point-source objects are imaged exactly inside the pinhole and give maximal intensity. An out-offocus object, even when it is on axis, is equivalent to an extended source on the input foc ...
Airy disk
In optics, the Airy disk (or Airy disc) and Airy pattern are descriptions of the best focused spot of light that a perfect lens with a circular aperture can make, limited by the diffraction of light. The Airy disk is of importance in physics, optics, and astronomy.The diffraction pattern resulting from a uniformly-illuminated circular aperture has a bright region in the center, known as the Airy disk which together with the series of concentric bright rings around is called the Airy pattern. Both are named after George Biddell Airy. The disk and rings phenomenon had been known prior to Airy; John Herschel described the appearance of a bright star seen through a telescope under high magnification for an 1828 article on light for the Encyclopedia Metropolitana:...the star is then seen (in favourable circumstances of tranquil atmosphere, uniform temperature, &c.) as a perfectly round, well-defined planetary disc, surrounded by two, three, or more alternately dark and bright rings, which, if examined attentively, are seen to be slightly coloured at their borders. They succeed each other nearly at equal intervals round the central disc....However, Airy wrote the first full theoretical treatment explaining the phenomenon (his 1835 ""On the Diffraction of an Object-glass with Circular Aperture"").Mathematically, the diffraction pattern is characterized by the wavelength of light illuminating the circular aperture, and the aperture's size. The appearance of the diffraction pattern is additionally characterized by the sensitivity of the eye or other detector used to observe the pattern.The most important application of this concept is in cameras and telescopes. Owing to diffraction, the smallest point to which a lens or mirror can focus a beam of light is the size of the Airy disk. Even if one were able to make a perfect lens, there is still a limit to the resolution of an image created by this lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.